Re: [PATCH] fix sym2 negotiation

[Olaf Hering <olh@suse.de>]

 On Tue, Aug 24, Mike Anderson wrote:

> Olaf Hering [olh@suse.de] wrote:
> >  On Tue, Aug 24, Mike Anderson wrote:
> > 
> > > I would guess this cdrom is behind a ACARD. We have had issues in
> > > the past with negotiation / interaction between the ACARD and the sym. 
> > 
> > Oh, that would be possible. I will look through our patches and find the
> > one that adds an insane delay. Maybe it helps.
> > 
> 
> Yes increasing scsi_inq_timeout to 27 seconds makes the messages go away
> on my system. Prior to increasing the timeout I bk pulled scsi-misc-2.6
> and received the same ABORT recovery sequence you did.

This patch fixed it. I'm sure this was already discussed on to dead, we
hit this bug initally one year ago with 2.4.21.


....

garloff@suse.de

Workaround

This broken chip seems to be so popular on PPC64 that the arch maintainers
want a PPC64 specific default. Oh well ...

diff -uNrp linux-2.6.5.inq_timeout/drivers/scsi/scsi_scan.c linux-2.6.5.inq_timeout.ppc64/drivers/scsi/scsi_scan.c
--- linux-2.6.5.inq_timeout/drivers/scsi/scsi_scan.c    2004-04-21 14:32:04.000000000 +0200
+++ linux-2.6.5.inq_timeout.ppc64/drivers/scsi/scsi_scan.c      2004-04-21 14:44:05.000000000 +0200
@@ -94,7 +94,17 @@ MODULE_PARM_DESC(max_report_luns,
                 "REPORT LUNS maximum number of LUNS received (should be"
                 " between 1 and 16384)");
 
+/* Some AChip ARC765 based DVD-ROM's take 15 or more seconds
+ * to reset.  A scan will fail if made right after a reset.
+ * It's completely broken device behaviour: SCSI specification
+ * says devices need to be able to respond to INQUIRY always
+ * (after a selection timeout ... of 250ms).
+ */
+#ifdef __powerpc64__
+static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+25;
+#else
 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3;
+#endif
 
 module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(inq_timeout, 



-- 
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sUse lINUX ag, nÜRNBERG
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